Here's my throttle. The pedal is cut off, and the BDR pedal is bolted to it. Really simple.
The throttle is mounted to a steel plate, which is then bolted to the firewall via existing bolts that hold the power booster in place. This is rock solid.
Of course, the firewall of the Mustang the pedal came out of is not flat. So You can't just use the existing holes as designed by ford. You'll have to modify the back of the pedal to make it mount on a flat panel. It will be obvious when you look at it.
Also, here is my cruise control. With fly by wire, it's almost a simple plug in. Unplug the harness from the pedal, and plug the CC harness between the pedal and the factory harness. Simple. Sort of. There are a couple of tricks you need to know that are not in the instructions. And I wanted to use a wireless control head. If you decide you're going to do this, let me know.